Stop-motion for machines



(No Model.) 7 3 Sheets-Sheet 1.

I. S. CRAIG. STOP MOTION FOR MACHINES.

N0. 448; 5'78. Patented Mar. 17, 1891.

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STOP MOTION FOR MACHINES.

No. 448,578. Patented Mar. 17, 1891.

INVENTEIRJ WITNESSES: $2

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(No Model.) 3 Sheets-Sheet 3.

I. S. CRAIG. STOP MOTION FOR MACHINES.

No. 448,578. PatentedMar. 17, 1891.

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lNITED STATES prion.

PATENT ISAAC S. CRAIG, OF SOMERVILLE, ASSIGNOR TO THE STANDARD RIVETCOMPANY, OF BOSTON, MASSACHUSETTS.

STOP-MOTION FOR MACHlN ES.

SPECIFICATION forming part of Letters Patent No. 448,578, dated March17, 1891.

Application filed April 16, 1890.

To ctZZ whom it may concern:

Be it known that I, IsAAO S. CRAIG, of Somerville, in the county ofMiddlesex and State of Massachusetts, have invented a new and usefulStop-Motion for Machines, of which the following is a specification,reference be ing had to theaccompanying drawings, in which- Figure 1 isa plan of my new stop-motion as it appears when applied to arivet-setting machine, the standard of the latter being sectioned. Fig.2 is an enlarged sectional elevation on line 2 2 of Fig. 1; and Fig. 3 asimilar elevation, but showing the parts in positions different fromthose they occupy in The object of my invention is to produce astop-motion for driving and other machines, whereby the driver, forexample, is rendered alternately operative and inoperative to drive thefastening (to give the operator time to feed his work.)

In the drawings, in which I show my new coupling applied to the mainshaft of a rivetsetting machine, although it may be used in a greatvariety of other machines, A is the frame; a, the main shaft; a, aneccentric fast on main shaft a; a the eccentric-strap, and a the rodconnecting the main shaft to the head of the machine, in this case to adriver-bar, which, however, is not shown, because the connection will bereadily understood by all skilled in the art.

B is the driving-pulley loosely mounted on main shaft to, and is formedwith a flange b, the edge of which is a cam-surface (see Fig. 1) havinga projection 19. (See Figs.2 and 3.)

D is a sleeve fast 011 main shaft a, and d is a forked lever fulcrumedto sleeve D at d Lever d is formed with projections (Z d, and d, aspring (Z (in this case mounted in a socket in sleeve D) engagingprojection d to throw the projection cl into engagement with projectionb, as hereinafter explained.

F is a lever fulcrumed at f and connect-ed to the rocker-arm (or itsequivalent) F by a detent f, the detent being fulciumed on arm f ofrocker-arm F, and having a recess f to engage projection f 011 lever F.A spring f co-operates with spring f? to keep Serial No. 348,140. (Nomodel.)

the projection f normally in the socket f of the detent, which has a lipf to prevent the spring f by means of which the treadle F is sustainedin its highest position, Fig. 3, from pulling detent out of engagementwith the projection f*. It is desirable to provide a stop f to preventthe free end of lever F from riding on the flange Z) of the pulley.

The operation of my coupling is as follows: When the parts are'in theposition shown n Fig. 3, the projection 61 on forked lever d is inengagement with the projection f on the free end of lever F, and held inthis position against the force of spring (1 as shown 1n Fig. 3. Whenthe treadle is depressed, as shown in Fig. 2, the detent f pushes leverF out of engagement with projection d, and this projection is snappedinto engagement with the cam-surface on flange Z) by the spring d.Rotation of pulley B brings the projection h into engagement with theprojection d and the pulley is thus coupled to its shaft a. As thepulley rotates, the projection d is brought into engagement with thefree end f of the detentf' and the detentf is moved out of engagementwith the projection f and the lever F, under the tension of spring fmoves toward the shaft a lnto the path of the projection (1. Furtherrotation brings projection (1 into engagement with the side of the freeend f of lever F, which is best curved slightly, as shown in Fig. 1,thereby moving the projection 61 out of the path of the notched flange band allowing the pulley to run free, the projection (l bringing upagainst projection f as shown in Figs. 1 and 3. \Vhen the treadle isdepressed, the shaft and pulley are coupled. The lever F is brought intoposition to move projection cl out of engagement with the flange as soonas the projection d has tripped the detent by engagement with thefree'end f, the shaft and pulley remaining coupled, however, until theprojection (1 is brought into engagement with the free end of lever F.Each time the driving-rod a is raised to actuate the treadle-driver thedriving pulley and shaft are coupled and remain coupled until theprojection f engages free end of lever F. A second fastening cannot bedriven until the treadle returns to its position of rest and is againdepressed.

In rivet-setting machines it has frequently happened that an operatorhas driven a fastening on top of one already set, owing to the rapidmovement of the machine and the operators slowness in moving his Work.By the use of my new stop-motion or coupling the machine is renderedinoperative as soon as one fastening is driven, and remains inoperativeuntil the lever F is again moved out of the path of the projection d,through treadle F detent f, and projection (1".

My new stop-motion is shown attached to the machine shown in Frank Beansapplication, Serial No. 348,257, filed April 16, 1890, of even dateherewith.

\Vhat I claim as my invention is In a setting-machine, the combinationof shaft a, loose pulley B, eccentric a, its strap a and rod a withrocking lever d, rotating with shaft a, lever F, and rocking detent f,pulley B being provided with a cam b and projection 11, lever d withprojections d d", lever F with a cam-surface f and shoulder f projection(Z, engaging projection I) to couple the pulley and shatt, projection61", engaging lever-f to bring cam-surface f and shoulder) into the pathof rocking lever 1 and cam-surface f rocking lever d out of engagementwith b to allow pulley B to run free, and shoulder f arresting lever 61all substantially as and for the purpose set forth.

ISAAC S. CRAIG.

Witnesses:

C. E. TINGLEY, EDWARD S. BEACH.

